Seiko Cal. 6643 - 580

This Spring Drive model from 1967 features a 43mm Gold-Plated case. It features a White dial protected by a Hardlex crystal and offers 30m of water resistance. [seikata-wm-3ae6f5e37922]

Also known as: Monster, World Timer

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

43mm

Case Thickness

14.0mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

30m

Dial Color

White

Jewels

31j

Frequency

21,600 bph

Power Reserve

64 hours

Year

1967

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